FKIE_CVE-2021-43536
Vulnerability from fkie_nvd - Published: 2021-12-08 22:15 - Updated: 2026-06-17 04:11
Severity
Summary
Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability affects Thunderbird < 91.4.0, Firefox ESR < 91.4.0, and Firefox < 95.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| mozilla | firefox | * | |
| mozilla | firefox_esr | * | |
| mozilla | thunderbird | * | |
| debian | debian_linux | 9.0 | |
| debian | debian_linux | 10.0 | |
| debian | debian_linux | 11.0 |
{
"affected": [
{
"affectedData": [
{
"product": "Thunderbird",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "91.4.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox ESR",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "91.4.0",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
},
{
"product": "Firefox",
"vendor": "Mozilla",
"versions": [
{
"lessThan": "95",
"status": "affected",
"version": "unspecified",
"versionType": "custom"
}
]
}
],
"source": "security@mozilla.org"
}
],
"configurations": [
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"versionEndExcluding": "95.0",
"vulnerable": true
},
{
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"matchCriteriaId": "F90A171C-1670-4EBA-9DE0-E31E8F3CD0FA",
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"vulnerable": true
},
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{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "Under certain circumstances, asynchronous functions could have caused a navigation to fail but expose the target URL. This vulnerability affects Thunderbird \u003c 91.4.0, Firefox ESR \u003c 91.4.0, and Firefox \u003c 95."
},
{
"lang": "es",
"value": "En determinadas circunstancias, las funciones as\u00edncronas podr\u00edan haber causado el fallo de una navegaci\u00f3n pero exponiendo la URL de destino. Esta vulnerabilidad afecta a Thunderbird versiones anteriores a 91.4.0, Firefox ESR versiones anteriores a 91.4.0 y Firefox versiones anteriores a 95"
}
],
"id": "CVE-2021-43536",
"lastModified": "2026-06-17T04:11:05.310",
"metrics": {
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{
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"baseSeverity": "MEDIUM",
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"accessComplexity": "MEDIUM",
"accessVector": "NETWORK",
"authentication": "NONE",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"confidentialityImpact": "PARTIAL",
"integrityImpact": "NONE",
"vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
"version": "2.0"
},
"exploitabilityScore": 8.6,
"impactScore": 2.9,
"obtainAllPrivilege": false,
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"obtainUserPrivilege": false,
"source": "nvd@nist.gov",
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"cvssMetricV31": [
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"published": "2021-12-08T22:15:09.563",
"references": [
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}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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